package com.xavier.book.spring_book_demo.interceptor;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.xavier.book.spring_book_demo.constant.Constants;
import com.xavier.book.spring_book_demo.model.Result;
import com.xavier.book.spring_book_demo.model.UserInfo;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

@Slf4j
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.info("preHandle目标方法执行前...");
        //true 放行, false 拦截
        HttpSession session = request.getSession(false);
        if (!checkUser(session)){
            response.setContentType("application/json;charset=utf-8");
            response.setStatus(401);
            ObjectMapper mapper = new ObjectMapper();
            String body = mapper.writeValueAsString(Result.unlogin());
            response.getOutputStream().write(body.getBytes("UTF-8"));
            return false;
        }
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        log.info("postHandle.....");
    }

    public boolean checkUser(HttpSession session){
        if (session == null || session.getAttribute(Constants.SESSION_USER_KEY)==null){
            log.warn("用户未登录");
            //用户未登录
            return false;
        }
        UserInfo userInfo = (UserInfo)session.getAttribute(Constants.SESSION_USER_KEY);
        if (userInfo==null || userInfo.getId()<=0){
            log.warn("用户未登录");
            return false;
        }
        log.info("用户已登录");
        return true;
    }

//    @Override
//    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
//        log.info("afterCompletion....");
//    }
}
